In earlier post I ahave describe how to use your Vodafone ZTE K3570-Z usb modem with other gsm sim. Today I am posting about how to use Vodafone USB Modem with other sim using default software. Vodafone K3570-Z comes with software lock so that we can easily modify it. When you use other sim with this modem it will says invalid sim due to software lock and it is not alow you to other sim. This is just because VMB (Vodafone Mobile Broadband) software block usage of other sim. Lest's have learn how to edit in software for use of other network sim.

Desclaimer: Kindly copy the file of which I have describe here to another directory an then change in original file, so that if you might miss any single step you can replace it and try again. This will not cause any damage to your modem but have take precaution.

Install VMB lite software in your computer if you alread installed it then bydefault the directory of it will be C:\Program Files\Vodafone\Vodafone Mobile Broadband\ If you install it in other location you can check it by just by right clicking on VMB shortcut on your desktop
go to property and click on Find Target button.

For an example you want to use Airtel sim on the modem for that just go to C:\Program Files\Vodafone\Vodafone Mobile Broadband\Opco. In this folder you will see a folder with your country name, for me it is India. To use other sim you have add an additional MCC MNC Code (Mobile Country and Network Code Configuration) for your other sim. To know about your SIM MCC MNC code just click here.

Edit First File:

For using Airtel you have to edit C:\Program Files\Vodafone\Vodafone Mobile Broadband\Opco\Opcos.XML first. To edit in Opcos.XML file right click on it and open with notepad. After opening file you will see below code in the file.

<?xml version="1.0" encoding="utf-8"?>

<Opcos>

........other codes here............

</Opcos>

For changing code just copy and paste below code just between <opcos> and </opcos>

Write your customer care number for phone. (CC number are different as per prepaid and postpaid customer in some region.)

Write your country prefix to PhonePrefix="+91" instead of "+91".

If you want to use two or more sim just add above code for each operator again with necessary chnges in <opcos> and </opcos>

Now you have to crate 2 new configuration file into VMC on C:\Program Files\Vodafone\Vodafone Mobile Broadband\Opco\India(while changing in file do remember to change in your country file instead of India if you are not from India).

You have to replace Airtel in code with your preferred
operator. The phone number can be your mobile number and change phoneprefix according to your country and save the
file with name of your MCCMNC code.xml (for me it is 40492.xml) in the direcotry C:\Program Files\Vodafone\Vodafone Mobile Broadband\Opco\India

Create third file:

Open new notepad and copy the following code and save with the name "Opco-MCCMNC.xml" (for me it's Opco-40492.xml) in C:\Program Files\Vodafone\Vodafone Mobile Broadband\Opco\India.

i have a vodafone dongle i.e K3772, i want to use the network which suits my preferences, aircel is the one i am looking for at the moment, i am not an expert like you, so will you please help me in unblocking this device?